Sideee



UNITED STATES Patented February 16, 1904.

VPATENT OFFICE.

AARMAND GABRIEL ooNsIDEEE, or Panis, FRANCE.

ARMED Ol? STVIFFENED CONCRETE-CONSTRUCTION.

SPECIFICATION forming part of Letters Patent No. 752,523, dated February 16, 1904.

`Application led J' une 27, 1902.

To @El whom t may concern:

Be it known that I, ARMAND GABRIEL GoN- .sIDERu a citizen of the Republic of France, residing in Paris, France, have invented certain new and useful Improvements in Armed or Stiifened Concrete Constructions, of which the following is a specification.

This invention has for its object to produce concrete or cement columns or the like structures which in service are adapted to withstand great compression or tension strains in a longitudinal direction. This object is secured by embedding strengthening-wires in helicoidal coils around a solid concrete core and covering the coils to protect them vfrom the atmosphere.

In the accompanying drawings, Figure 1 is a longitudinal section of part of a column constructed to sustain longitudinal pressure. Fig. 2 is a cross-section ofthe same. Fig. 3 is a view similar to Fig. 1 of a modification with longitudinal strengtheningfrods. Fig. et is a cross-section of the same.' Fig. 5 is a longitudinal section, and Fig. 6 is a cross-section ot' a column with a greater number of longitudinal rods and which is to sustain longitudinal tension. Fig. 7 is a side view showing a means for tensioning the longitudinal rods before applying the concrete.

As shown in Figs. l, 3, and 5, a helicoidal coil of metal c' isl embedded in a solid core of concrete or cement, so as to embrace the greater part of the solid core, but sufficiently below the surface to be protected from the atmosphere by the outer covering.

In Figs. 3, 4, 5, and 6 besides the helicoidal coils the core lis provided with a number of longitudinal metal rods c. The object of thusencircling the solid core with the helicoidal coils a. of metal is toovercome the tendency of the concrete column when placed under compression strain longitudinally from breaking by llateral expansion of the column later. These helicoidal coils thus greatly increase the strength of a concrete column. It also has been found that when such-column has been collapsed by excessive pressure under. test warning is given for quite a time before rupture.

Tensional strains in my improved columns Serial No. 113,467. (No model.)

or cables are met by providing within the coils a many longitudinal rods c, as shown particularly in Fjgs. 5 and 6.

vIn Fig. 7 I have represented a practical construction for carrying into effect a method of giving a preliminary tension to the longitudinal wires c. They are suspended like an ordinary cable, and I hang a foot-bridge or other temporary structure on them to cause them to take up the curve or other shape that 6c the resulting bridge `may require, and I then apply the helicoidal coils and concrete to these cables. By this means rupture of the concrete when the finished tension members are put under tension in use will be avoided.

I am aware that it has previously been proposed to embed in concrete pipes rings of metal; but these structures are hollow and for that reason are not adapted to stand compression or tension strains in a longitudinal direction 7o to which my solid columns or cables are to be subjected.

I am aware 'of British Patents No. 1,715 of 1874 and No. 14,559 of 1885, showing skeletons of iron made with spiral coils riveted to 7 5 each other or to longitudinal rods to carry concrete; but in my beams the concrete forms the essential basis of the column and my coils are independent-that is, not connected to the other coils or to longitudinal rods in the con- 8o crete.

I claim as my invention- 1. A column or the like of concrete, comprising a solid concrete core with independent helicoidal coils of metal surrounding said core, 8'5

'and arranged very close together, substantially as described. v v

2. A column or the like of concrete, comprising a solid concrete core with independent helicoidal coils of metal surrounding said core, 9o and arranged very close together, and a covering for the coils, substantially as described.

' 3. A column or the like of concrete, comprising a solid concrete core, longitudinal rods within the core and independent helicoidal coils of metal arranged very close together and surrounding the core and rods, substantially as described.

4. A column or the like of concrete, compr1s1ng a solid concrete core, longltudinal rods I OO Within the core and independent helicoidal coils of metal arranged very close together and surrounding the core and rods, and a covering for the coils, substantially as described.

5. A concrete construction, comprising longitudinal metal rods tensioned in the shape they are to maintain, and a concrete covering for said rods to make a solid core, and independent helicoidal coils arranged very close -soribing Witnesses.

together, surrounded and retainingthe core, IO` substantially as described.l

In testimony whereof I have signed my name to this speciicati'on in the presence of two sub- ARMAND GABRIEL CONSIDERE. Witnesses:

LoN FRANCKEN, EDWARD P. MACLEAN. 

